The social games maker, which started losing ground earlier last year, had previously earmarked 13 undisclosed games for closure. Last week, TechCrunch identified 11 games which were either already shut down or close to it.

Some of the titles include PetVille, Mafia Wars 2, ForestVille, Vampire Wars and Indiana Jones Adventure World. A Zynga spokeswoman declined to comment, but when you try to visit the games on Facebook, there’s a message redirecting players to check out some of Zynga’s other games, like CastleVille, ChefVille, FarmVille 2, Mafia Wars and YoVille.

There’s a reason why these games eventually must be put to sleep.

The mechanics simply don’t work anymore if a lot of people aren’t playing them — after all, they are social games. If friends aren’t around to tend to your crops or visit your pet when you are away for too long, the games simply break down.

Having a large enough base of players to continue momentum is a problem that extends to other game publishers, too.

But as more games become services and are played against other people, instead of computers, other services are being shut down on game consoles, mobile phones and the PC. In January, EA said, it plans to shut down a myriad of services, like FIFA Soccer 11 Ultimate Team for PlayStation 3 and Xbox, and Madden NFL 11 for all three major consoles.

On Zynga’s chopping block, the most popular game is PetVille, which continues to attract a million users every month and 60,000 users daily.

The others are significantly less popular, such as Mafia Wars 2, which has as few as 200,000 monthly and 10,000 daily visitors, according to App Data. Compared to its top-performing titles, like FarmVille 2, which gets 43.5 million monthly and 8.1 million daily users, that’s clearly not very many well-loved pets.

As part of the cost-cutting measures, the San Francisco company also reduced headcount by 5 percent, including some of the developers in Austin who were working on The Ville.

The company’s stock did not respond favorably to the plan, and continues to trade at $2.36 a share, down from a high of nearly $16 over the past year.

Perhaps it’s because investors don’t just want to see how it can cut costs, but how it can generate new streams of revenue. In other words, can Zynga can innovate in new areas that span beyond the ’Ville genre and Facebook? A new hit is what the company has been sorely lacking for the better part of 2012.

By freeing up resources, it at least has a chance.

About halfway through 2012, Zynga started prioritizing new game categories, like mid-core gaming and the casino genre. For instance, in mid-December, it launched Elite Slots on Facebook.

Electronic Arts is also clearly deciding where best to spend its resources, and Facebook is not a favorite. As part of its earnings call in October, it disclosed that the number of people actively playing its games on Facebook dropped by more than half in the past year. Therefore, it was reducing the number of Facebook games it was building this year.

I think the NSA has a job to do and we need the NSA. But as (physicist) Robert Oppenheimer said, “When you see something that is technically sweet, you go ahead and do it and argue about what to do about it only after you’ve had your technical success. That is the way it was with the atomic bomb.”

AllThingsD by Writer

AllThingsD.com is a Web site devoted to news, analysis and opinion on technology, the Internet and media. But it is different from other sites in this space. It is a fusion of different media styles, different topics, different formats and different sources. Read more »